package w2.sy2_2;

import java.util.Scanner;

public class Main {
	// 输入正方形边长，求面积，保留3位小数。
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		double d = in.nextDouble();
		double area = d * d;
		System.out.printf("%.3f\n", area);
	}
}
